Explosion proof high voltage resistance arrester

ABSTRACT

Lightning arresters of the type where yield resistors surrounding the spark gaps have resistors of toroidal or annular form divided into sectors; the various resistors being arranged in such a way that the said divisions are placed one under another or in helical configuration, so as to form a vertical or spiral duct.

Umted- States Patent 1 [111 3,708,711

Deville [451 Jan. 2, 1973 s41 EXPLOSION PROOF HIGH VOLTAGE 2,284,478 5/1942 Roloson ..3l3/DlG. s

RE I TAN ARRESTER 3,484,863 12/1969 Kershaw ..3l3/325 UX 3,5l8,483 6/1970 Eason et al. ..3l5/36 [75] Inventor: Robert Deville, ,Villeurbanne, 2,392,679 1/1946 MacCarthy ..313/325 X FOREIGN PATENTS OR APPLICATlONS [73] Asslgnee' nelk'mnhom V'neurbanne France 61,877 12/1954 France ..313/325 [22] Filed: Feb. 22, 1971 Primary Examiner-David Schonberg [21] Appl' n7612 Assistant ExaminerToby H. Kusmer Attorney-Sughrue, Rothwell, Mion, Zinn & Macpeak [30] Foreign Application Priority Data ABSTRACT Feb. 24, 1970 France ..7006630 g t g testers of the yp where yield resistors surrounding the spark gaps have resistors of toroidal [52] U.S. Cl. ..313/325, 3l3/23l.1, 315/36 annular form divided into sectors; the various [51] Int. Cl ..H0lj 17/00 Sisters being arranged in Such a way that the Said i Fleld of Search 315/35, 36 sions are placed one under another or in helical configuration, so as to form a vertical or spiral duct.

[56] References Cited M 7 i UNITED STATES PATENTS 9/1966 Sacer ou 36 n ms Drawing F s EXPLOSION PROOF HIGH VOLTAGE RESISTANCE ARRESTER BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to lightning arresters and more particularly to a yield arrester for high-tension lines.

2. Description of the Prior Art For high voltages, the height of arresters or surge l diverters becomes very great and arrangements of principal elements (spark arresters, flow resistances, and voltage distribution members, such as resistances and possibly condensers), which make it possible to reduce it, are necessary. It is known to arrange the active parts in two or three cells, separated by insulating dishes and connected by adequate connections. However, this arrangement entails the inconvenience of considerably increasing the diameter of the casing of the apparatus. According to another known arrangement, ring-shaped flow resistances may surround the spark arresters, but this solution requires special arrangements for the mounting of the voltage distribution members. Furthermore, in arresters equipped with flow valves, intended, in the case of internal flashover, to evacuate the gases, with a view to preventing the explosion of the casing, there is often no direct way with a sufficient cross section between the upper portion and the lower portion of the arrester and this can reduce the efficiency of the anti-explosion valve.

Around the stack of ring-shaped flow resistances, one can create passages for the evacuation of the gases; but this results in a major increase'in the diameter of the arrester and creates difficulties in centering the active portion of the arrester inside the latters casing; the shape which one must thus give to this casing entails major production costs.

SUMMARY OF THE INVENTION The arrester according to the invention involves an arrangement of active portions making it possible to simultaneously considerably reduce the height without any major increase in the diameter of the arrester and, over the entire height of the apparatus, to assure a sufficient slow cross section and a direct path for the gases which, in case of flashover, appear inside the arrester.

According to the invention, in a high-voltage arrester involving a vertical stack of spark arresters and flow resistances in the form of rings surrounding the spark arresters, each one of said rings presents a cut-out sector, and the flow resistances are arranged with respect to each other in such a manner that the cut-out of successive resistances are placed at least partly one above the other, so as to form an evacuation conduit for the gases, directed vertically, and included in the interior of the general cylindrical space of the stack of resistances.

The gas evacuation conduit thus formed can in particular be straight-line or helicoidal. The cut-out of the flow resistances preferably has the form of a sector. In the gas evacuation conduit, one can advantageously arrange voltage distribution members.

BRIEF DESCRIPTION OF THE DRAWINGS The invention is described in detail below with reference to the attached drawing where:

FIG. I is a plan view of one way of implementing the invention.

FIG. 2 is a cross-sectional view of a fraction of the arrester according to the vertical plane XY for an observer looking in the direction of the arrow indicated in FIG. 1.

FIG. 3 isa plan view of a variation of the invention.

DESCRIPTION OF THE PREFERRED EMBODIMENT The spark arresters, such as 1 and 9, are situated inside flow resistances in the form of a fraction of tores, such as 2 and 12, which furthermore can be constituted of several sectors, such as 3 and 4. The groups of spark arresters, such as 1 and 9, are connected to the flow resistances by connections such as 6, 8, 10, and the insultation between two connections, such as 6 and 8, connected to the opposite faces of one and the same resistance, is accomplished by means of insulating disks, such as 7, 11, whose section, passing through the axis, has the shape of a Diabolo or hour-glass-shaped toy, which permits a small thickness and a relatively large leakage path.

The voltage distribution members 5 are arranged in the zone corresponding to the missing sectors of the ring-shaped resistances. The active parts are placed inside a casing 13 which surrounds them. The straight and vertical conduit 14, corresponding to the portion left free by the distribution members 5 within the missing sector of the resistances, permits the easy flow of the gases toward the evacuation valve or valves of the arrester in case of fiashover inside the casing 13.

In the free space 14, one can arrange an insulating tie-rod 15 which assures the mechanical attachment of the elements of the arrester. One can also create a second conduit which will likewise be straight and vertical but which will have a smaller cross section, inside the general cylindrical space of the stack of resistances, in order to place there a second insulating tie-rod 16 for the attachment of the arrester elements. In the example shown in FIG. 3, this second conduit is made up of the free space obtained by reducing one or the other of elements 3 and 4 of the flow resistances.

What is claimed is:

1. In a high-voltage arrester involving a vertical stack of spark arresters and flow resistances in the form of rings which surround the spark arresters, the improvement comprising: each of said rings including at least one circumferential cut-out portion, the flow resistances being arranged with respect to each other such that the cut-out portions of successive resistances are placed at least partly one above the other, to form a vertically directed gas evacuation conduit, said conduit being included inside the general cylindrical space defined by the stack of resistances.

2. The high-voltage spark arrester according to claim 1, wherein said cut-out portion is sector-shaped.

3. The high-voltage arrester according to claim 1, further including: voltage distribution elements which are installed in the gas evacuation conduit defined by the cut-out portions of said rings.

4. The high-voltage arrester according to claim 1, wherein said gas evacuation conduit is straight and contains an insulating tie-rod for the attachment of the arrester elements.

5. The high-voltage arrester according to claim 4, including two cut-out portions, one of said portions defining a second straight and vertical conduit of smaller cross section inside the general cylindrical stack of resistances, said second conduit containing a 5 second insulating tie-rod for the attachment of the arrester elements. 

1. In a high-voltage arrester involving a vertical stack of spark arresters and flow resistances in the form of rings which surround the spark arresters, the improvement comprising: each of said rings including at least one circumferential cut-out portion, the flow resistances being arranged with respect to each other such that the cut-out portions of successive resistances are placed at least partly one above the other, to form a vertically directed gas evacuation conduit, said conduit being included inside the general cylindrical space defined by the stack of resistances.
 2. The high-voltage spark arrester according to claim 1, wherein said cut-out portion is sector-shaped.
 3. The high-voltage arrester according to claim 1, further including: voltage distribution elements which are installed in the gas evacuation conduit defined by the cut-out portions of said rings.
 4. The high-voltage arrester according to claim 1, wherein said gas evacuation conduit is straight and contains an insulating tie-rod for the attachment of the arrester elements.
 5. The high-voltage arrester according to claim 4, including two cut-out portions, one of said portions defining a second straight and vertical conduit of smaller cross section inside the general cylindrical stack of resistances, said second conduit containing a second insulating tie-rod for the attachment of the arrester elements. 